Summary

This document provides an outline of network theorems, including superposition, Kirchhoff's laws, Thevenin's theorem, Norton's theorem, and reciprocity. It also covers various aspects of electrical networks, such as classification and examples. The document appears to be lecture or study material for an electronics or electrical engineering course/class.

Full Transcript

4/16/2024 OUTLINE NETWORK THEOREMS CLASSIFICATION OF NETWORKS SUPERPOSITION KIRCHHOFF'S LAWS THEVENIN ELE 314 NORTON...

4/16/2024 OUTLINE NETWORK THEOREMS CLASSIFICATION OF NETWORKS SUPERPOSITION KIRCHHOFF'S LAWS THEVENIN ELE 314 NORTON RECIPROCITY 1 2 3 4 4/16/2024 CLASSIFICATION OF ELECTRICAL NETWORKS CLASSIFICATION IS BASED ON TWO THINGS 1. PROPERTIES OF CIRCUIT ELEMENTS 2. RESPONSE OF THE NETWORK TO DIFFERENT EXCITATION THE FIRST THREE ARE BASED ON THE PROPERTIES OF CIRCUIT ELEMENTS THE REMAINING TWO ARE BASED ON RESPONSE OF THE NETWORK TO DIFFERENT EXCITATION 5 6 7 8 4/16/2024 1. DIODE 2. TRANSISTOR 3. EXAMPLE OF NETWORK IS RECTIFIER CIRCUITS 9 10 11 12 4/16/2024 13 14 15 16 4/16/2024 17 18 SUPERPOSITION 19 20 4/16/2024 TAKE ONE VOLTAGE OR CURRENT SOURCE AT A TIME AND REPLACE OTHER SOURCES WITH THEIR INTERNAL IMPEDANCE ,.. 21 22 23 24 4/16/2024 IDEAL VOLTAGE IDEAL SOURCES CURRENT ARE SOURCES ARE REPLACED REPLACED WITH WITH OPEN TOTAL CURRENT I = I1 + I2 CIRCUITS SHORT CIRCUITS 25 26 SUPERPOSITION THEOREM IDEAL VOLTAGE SOURCES ARE REPLACED WITH SHORT CIRCUITS IDEAL CURRENT SOURCES ARE REPLACED WITH OPEN CIRCUITS SUPERPOSITION THEOREM IS APPLICABLE TO LINEAR BILATERAL NETWORKS 27 28 4/16/2024 29 30 31 32 4/16/2024 33 34 It is a balanced Wheatstone bridge, Hence, the current through the 1ohm Resistor is zero 35 36 4/16/2024 It is a balanced Wheatstone bridge 37 38 39 40 4/16/2024 41 42 43 44 4/16/2024 45 46 Both currents are in the same direction and hence total voltage is 47 48 4/16/2024 Kirchoff's current law (KCL) states that the algebraic sum of branch currents flowing into and out of a node is equal to zero. This is an outcome of the principle of the conservation of electric charge. If any new charge enters a node some equal amount of charge must exit. 49 50 ILLUSTRATIONS ILLUSTRATIONS 51 52 4/16/2024 Example 1 Use KCL and KVL to obtain current values in all branches of the circuit Kirchhoff's Voltage Law states that: The voltage around a loop equals the sum of every voltage drop in the same loop for any closed network and equals zero. Put differently, the algebraic sum of every voltage in the loop has to be equal to zero and this property of Kirchhoff's law is called conservation of energy. 53 54 Example 2 Assign Current in the branches Use KCL and KVL to obtain current values in all branches of the circuit 55 56 4/16/2024 EXAMPLE 3 Use KCL and KVL to obtain current values in all branches of the circuit 57 58 EXAMPLE 2 Use KCL and KVL to obtain current values in all branches of the circuit 59 60 4/16/2024 61 62 63 64

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